m-n(n)
  .m-{n}
    margin (n / 4) rem

m-n(1)
m-n(2)
m-n(3)
m-n(4)

mt-n(n)
  .mt-{n}
    margin-top (n / 4) rem

mt-n(1)
mt-n(2)
mt-n(3)
mt-n(4)

mb-n(n)
  .mb-{n}
    margin-bottom (n / 4) rem

mb-n(1)
mb-n(2)
mb-n(3)
mb-n(4)

my-n(n)
  .my-{n}
    margin-bottom (n / 4) rem
    margin-top (n / 4) rem

my-n(1)
my-n(2)
my-n(3)
my-n(4)
